Add "Suspicious collection reassignment" inspection #KT-20626 Fixed

idea/testData/quickfix/suspiciousCollectionReassignment/replaceWithAssignment/used.kt

@@ -0,0 +1,15 @@
+// "Replace with assignment" "false"
+// TOOL: org.jetbrains.kotlin.idea.inspections.SuspiciousCollectionReassignmentInspection
+// ACTION: Change type to mutable
+// ACTION: Replace overloaded operator with function call
+// ACTION: Replace with ordinary assignment
+// WITH_RUNTIME
+fun test(otherList: List<Int>) {
+    var list = listOf<Int>()
+    foo(list)
+    bar()
+    list <caret>+= otherList
+}
+
+fun foo(list: List<Int>) {}
+fun bar() {}